Enhanced negative thermal expansion by solid solution of HfMgMo sub(1.5)W sub(1.5)O sub(12)

HfMgMo sub(3)O sub(12) exhibits a low positive thermal expansion and HfMgW sub(3)O sub(12) displays a low negative thermal expansion (NTE). It is found that the solid solution of HfMgMo sub(1.5)W sub(1.5)O sub(12) has an enhanced NTE with lower anisotropy with respect to HfMgMo sub(3)O sub(12) and H...

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Bibliographic Details
Published in:Materials express 2016-12, Vol.6 (6), p.515-520
Main Authors: Li, Tao, Ge, Xianghong, Liu, Xiansheng, Cheng, Yongguang, Liu, Yaming, Yuan, Huanli, Li, Sailei, Liu, Yayun, Guo, Juan, Sun, Qiang, Li, Yuxiao, Liang, Erjun
Format: Article
Language:English
Subjects:
Anisotropy
Cations
Displays
Electronegativity
Solid solutions
Thermal expansion
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Summary:HfMgMo sub(3)O sub(12) exhibits a low positive thermal expansion and HfMgW sub(3)O sub(12) displays a low negative thermal expansion (NTE). It is found that the solid solution of HfMgMo sub(1.5)W sub(1.5)O sub(12) has an enhanced NTE with lower anisotropy with respect to HfMgMo sub(3)O sub(12) and HfMgW sub(3)O sub(12). The coefficients of thermal expansion (CTEs) for HfMgMo sub(1.5)W sub(1.5)O sub(12) are alpha sub(a)= -6.78 10 super(-6) K super(-1), alpha sub(b)= 6.59 10 super(-6) K super(-1), alpha sub(c)= -5.23 10 super(-6) K super(-1), alpha sub(v)= -6.19 10 super(6-) K super(-1) for the a-, b- and c-axes and volume, respectively. This gives rise to a linear CTE of alpha sub(l)= -2.06 10 super(-6) K super(-1). The alternative arrangements of W and Mo around each octahedra and differences in electronegativity and cation radius between W and Mo account probably for the enhanced NTE and decreased anisotropy with respect to HfMgMo sub(3)O sub(12).
ISSN:2158-5849
DOI:10.1166/mex.2016.1337